Pneumatic hammer.



V. E. LANE.

PNEUMATIG HAMMER. APPLICATION FILED JUNE 21. 1909.

Patented Oct. 31, 1911.

ATTORNEYS direction of the arrow, and showin VICTOR EDWARD LANE, 0EBERWICK; PENNSYLVANIA.

PNEUMATIC HAMMER.

Specification of Letters Patent.

Patented oct. s1, 1911.

Application led June 21, 1909. Serial No. 503,320.

To all 'whom 'it may concern:

Be it known that I, VICTOR EDWARD LANE, a citizen of the United States,and a resident of Berwick, in the county of Columbia and State ofPennsylvania, have invented a new and Improved Pneumatic Hammer, ofwhich the following is a full, clear, and exact description.

My invention'relates to pneumatic hammers, and has for its object to.provide a detachable nose piece carrying the rivet set, or equivalenttool, and so arranged that the nose piece, 4when removed from thebarrel, carries with it the rivet set, while the rivet set is in turndetachable from the nose piece independently of whether the latter bemounted upon the barrel or not.

A further object of the invention is to provide a simple, cheap andeicient means for securing the nose piece to the barrel."

Reference is to be had to the accompanying drawings forming a part ofthis speci- -fication, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a substantially central vertical section through the entireanimer, and showing the relation of the plunger, the movable sleeve, thebarrel, and rivet set and the handle; Fig. 2 is an enlarged crosssection on the line 2-2 of Fig. 1, looking in the direction ofthe arrow,and showing how the rivet set is detachably mounted in relation to thenose piece; Fig. 3 is a section upon the line 3--3 of Fig. 1, looking inthe how the nose piece is detachably connecte with the bar-rel; Fig. 4is an enlarged cross section upon the line 4-4 of Fig. 1, looking in thedirection of the arrow and showing how the barrel vand the movablesleeve encircled by it are put together; Fig. 5 is an enlarged sectionsubstantially upon the line 5-5 of Fig. 1, looking in the direction ofthe arrow, and showing the spring and parts associated therewith forretracting the air valve to its normal position; and Fig. 6 is a detailshowing a portion of the spring band appearing in Fig. 3, and showing ahole through the abutting ends of said band to facilitate theapplication of a tool for the purpose of loosening and removing the bandi and the pins carried by it. Fig. 7 isa detail showing the valve springand parts associated therewith.

The handle of the hammer is shown at 7,

,At 11 is a nose piece, and supported by the same is a rivet set 12provided with a stem 47 which extends slidably into the nose piece.

The handle 7 is provided with a groove -13, and pivotally mountedwithinl this groove is a lever 14. Slidably mounted within the handle 7is a valve stem 15 which is engaged by the lever 14. A valve 16 isconnected with the Valve stem 15 and thus actuated by movements of thelever 14.

The'handle 7 is provided with an air passage 17 which is connected upwith a suitable source of air supply,for the purpose of actuating thehammer. Communicating with the air passage 17 is a valve chamber 18 inwhich the valve 16 is slidably mounted. A spiral spring 19 engages thevalve 16 -and is held in position by a cap 20. This cap is provided withan annular flange 21 having pins 21i projecting inwardly from the same.A boss 22 integral with the handle 7 is of proper size for this cap tofit upon, and is provided with longitudinal grooves 23, which reach andmerge into a single annular groove 23a. The boss 22 is further providedwith two notches 22a merging into the annular groove 23a. In placing thecap 20 upon the boss 22, the pins 21 carried by the cap lare fitted intothe longitudinal grooves 23, and the cap is then pushed"` to the leftaccording to Fig. 1, so that the pins 21El enter the groove 23". The capisy now given a quarter of a turn, so that the pins pass into thenotches 22a. The spiral spring 19 being under compression causes thepins 21a to snap into the notches 22a as soon as the cap is turned asjust described for this purpose. The cap 20 is thus effectively lockedin position, but is nevertheless so held that t-he operator may at willreadily disengage it. This he does by giving it another quarter of aturn, meanwhile pressing upon the cap so as to slightly compress thespring 19. e

The inner sleeve 9 of the barrel is provided with air passages '25 and25", shown in Figs. 1 and 4. The air passage 25 extends from a hole 26in this sleeve to a. hole 32 in passes through the holes 36a into thebarrel and follows the annular groove 33i in the movable sleeve, passingthrough the holes 30a and 31a into the interior of the movable sleeve 10and back of the plunger 34. The pressure of this air starts the plungerupon its down stroke. The air in front of the plunger, having a freeexhaust through the holes 3T, 33, 39 and 40, offers no obstruction tothe stroke of the plunger. IVhen the plunger has nearly reached the endof its down stroke, the air escapes through the holes 27 in the movablesleeve and into and around the annular groove 28. The air then passesback through the groove 25 and through the holes 32 into the interior ofthe barrel, back of the movable sleeve 10. The cross section area ofthis opening, back of the sleeve 10, being larger than the cross sectionarea inside of the movable sleeve 10, the pressure back of the sleeve 10overcomes the pressure inside of this sleeve and thus shifts the movablesleeve forward a trifle or enough to close the holes 31, 27, 37, 38, 39and 40, and to bring the holes 36 into registry with the holes 35 andwith the annular groove 28a in the movable sleeve 10. The hole 31b isalso brought into registry with the annular groove 31 and the holes 30in the movable sleeve. The forward or down stroke of the movable sleeveopens the hole 32, which allows the air after per forming its mission ofmoving the sleeve 10 as described, to escape, the air passing out of thehole 32a." The down stroke of the plunger having thus been accomplishedand the movable sleeve following directly after and the holes 31a beingnow closed, the holes 36 and 35 being in registry, the air passesthrough these holes into the interior of the movable sleeve and in frontof the plunger 34. This starts the plunger on its back stroke. The airahead of the plunger upon this back stroke is exhausted throiugh theholes 30 and the annular groove 31 in the movable sleeve and through thehole 31b in the barrel, these holes being now in registry. The plunger34 now reaches and closes these openings, whereupon the balance of theair between the plunger and the cap 33 of the movable sleeve 10 formsmomentarily a cushion, thus preventing a violent blow between theplunger 34 and the cap 33. The back stroke of the plunger,

however, shifts the movable sleeve 10 back into its first position, asindicated in Fig. 1. The reciprocating movementof theplunger 34 and themovable sleeve 10 continues as above described so long as the airpressure is allowed to enter the hammer. \Vhi1e the up stroke of theplunger is cushioned, the down stroke ends in a dead or solid blow.

The device is so arranged that the back stroke of the plunger 34 isactuated slightly by the action ofthe air. The inner sleeve 9 and the outer sleeve 8, put together as above described, constitute the barrel ofthe hammer and this barrel, as is apparent from a the foregoingdescription, is provided with various air passages 25 which communicatewith various air holes.

While. barrels for pneumatic hammers have heretofore been constructedand provided with passages somewhat analogous to the air passages 25,the manufacture of such barrels has been difficult, owing to the laborand expense of boring the air passages in question.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a pneumatic hammfer, the combination of a barrel having its endinclined downwardly and outwardly, a nose piece provided with a shoulderinclined downwardly and outwardly with which the end of the barrelengages, the inclined end of the barrel and the inclined shoulder of thenose piece serving to aid in holding the bar# rel and nose piecetogether, and fastening members for holding said nose piece detachablyin position upon said barrel.

2. In a pneumatic hammer, the combination of a. barrel, a nose pieceextending into the barrel, a band surrounding the barrel and havinginturned endsl sunken into the barrel, an opening being formed in theband at the inturned ends, and pins carried by the band and passingthrough the barrel into engagement with the nose piece.

In testimbny whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

VICTOR EDWARD LANE.

Witnesses ALBERT SPAIDE, D. E. BOGARD.

